I think you'll find good improvement with your new tyres etc., and go in the 3's, just as a comparison, this was my old 10.1CR 360hp 340ci 727 street/strip car back in the 80's, all steel, 3500lbs....4.30's/4200 TA verter 10x28's on stock springs clamped at the front w/snubber, long shocks,
[email protected], 1.73 60...with a best of 12.39 NA